A5067408026- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Relativity and Gravitational Theory
- Astro and Planetary Science
- Black Holes and Theoretical Physics
- Geophysics and Gravity Measurements
- Statistical and numerical algorithms
- Remote Sensing in Agriculture
- Scientific Research and Discoveries
- Chronic Lymphocytic Leukemia Research
- Plant Water Relations and Carbon Dynamics
- Cancer Immunotherapy and Biomarkers
- Computational Physics and Python Applications
- Solar and Space Plasma Dynamics
- Meteorological Phenomena and Simulations
University of Illinois Urbana-Champaign
2016-2025
China Meteorological Administration
2018-2025
Chinese Academy of Sciences
2024-2025
InertialWave (United States)
2025
National Center for Supercomputing Applications
2016-2024
Luye Pharma (China)
2023-2024
Henan Agricultural University
2023-2024
Jilin Agricultural University
2024
South China Agricultural University
2022-2024
Chongqing University
2023-2024
We present the fifth edition of Sloan Digital Sky Survey (SDSS) Quasar Catalog, which is based upon SDSS Seventh Data Release. The catalog, contains 105,783 spectroscopically confirmed quasars, represents conclusion SDSS-I and SDSS-II quasar survey. catalog consists objects that have luminosities larger than M_i = -22.0 (in a cosmology with H_0 70 km/s/Mpc Omega_M 0.3, Omega_Lambda 0.7) at least one emission line FWHM 1000 km/s or interesting/complex absorption features, are fainter i > 15.0...
We present a compilation of properties the 105,783 quasars in SDSS Data Release 7 (DR7) quasar catalog. In this value-added product, we compile continuum and emission line measurements around Halpha, Hbeta, MgII CIV regions, as well other quantities such radio properties, broad absorption (BALQSO) flags, disk emitters. also virial black hole mass estimates based on various calibrations. For fiducial use Vestergaard & Peterson (VP06) calibrations for Hbeta CIV, our own calibration which...
The Very Large Array Sky Survey (VLASS) is a synoptic, all-sky radio sky survey with unique combination of high angular resolution ($\approx$2.5"), sensitivity (a 1$\sigma$ goal 70 $\mu$Jy/beam in the coadded data), full linear Stokes polarimetry, time domain coverage, and wide bandwidth (2-4 GHz). first observations began September 2017, observing for will finish 2024. VLASS use approximately 5500 hours on Karl G. Jansky (VLA) to cover whole visible VLA (Declination $>-40^{\circ}$), total...
We compile black hole (BH) masses for ~60,000 quasars in the redshift range 0.1≲ z≲ 4.5 included Fifth Data Release of Sloan Digital Sky Survey, using virial BH mass estimators based on Hβ, Mg II, and C IV emission lines. Within our sample, widths three lines follow lognormal distributions, with means dispersions that do not depend strongly luminosity or redshift. The II- Hβ-estimated are consistent one another, but there is a positive bias between IV- II-estimated correlated IV-Mg II...
We present the fourth edition of Sloan Digital Sky Survey (SDSS) Quasar Catalog. The catalog contains 77,429 objects; this is an increase over 30,000 entries since previous edition. consists objects in SDSS Fifth Data Release that have luminosities larger than Mi = -22.0 (in a cosmology with H0 70 km s-1 Mpc-1, ΩM 0.3, and ΩΛ 0.7), at least one emission line FWHM 1000 or interesting/complex absorption features, are fainter i ≈ 15.0, highly reliable redshifts. area covered by ≈5740 deg2....
Using a sample of 30,000 quasars from SDSS-DR7, we explore the range properties exhibited by high-ionization, broad emission lines, such as CIV 1549. Specifically investigate anti-correlation between L_UV and line EQW (the Baldwin Effect) "blueshifting" high-ionization lines. The blueshift is nearly ubiquitous, with mean shift 810 km/s for radio-quiet (RQ) 360 radio-loud (RL) quasars, Effect present in both RQ RL samples. Composite spectra are constructed function attempt to reveal empirical...
We study the two-point correlation function of a uniformly selected sample 4426 luminous optical quasars with redshift 2.9 ≤ z 5.4 over 4041 deg2 from Fifth Data Release Sloan Digital Sky Survey. fit power-law to projected wp(rp) marginalize redshift-space distortions and errors. For real-space form ξ(r) = (r/r0)-γ, fitted parameters in comoving coordinates are r0 15.2 ± 2.7 h-1 Mpc γ 2.0 0.3, scale range 4 rp 150 Mpc. Thus high-redshift appreciably more strongly clustered than their ≈ 1.5...
We present the discovery of nine quasars at $z\sim6$ identified in Sloan Digital Sky Survey (SDSS) imaging data. This completes our survey SDSS footprint. Our final sample consists 52 $5.7<z\le6.4$, including 29 with $z_{\rm AB}\le20$ mag selected from 11,240 deg$^2$ single-epoch (the main survey), 10 $20\le z_{\rm AB}\le20.5$ 4223 overlap regions (regions two or more scans), and 13 down to AB}\approx22$ 277 Stripe 82. They span a wide luminosity range $-29.0\le M_{1450}\le-24.5$....
Fast radio bursts (FRBs) are one of the most tantalizing mysteries sky; their progenitors and origins remain unknown until now no rapid multiwavelength follow-up an FRB has been possible. New instrumentation decreased time between observation discovery from years to seconds, enables polarimetry be performed on FRBs for first time. We have discovered (FRB 140514) in real-time 14 May, 2014 at 17:14:11.06 UTC Parkes telescope triggered other wavelengths within hours event. 140514 was found with...
We present a catalog of 5039 broad absorption line (BAL) quasars (QSOs) in the Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5) QSO that have troughs covering continuous velocity range ⩾2000 km s−1. fitted ultraviolet (UV) continua and emission each case, enabling us to report common diagnostics BAL strengths velocities −25, 000 0 s−1 for Si iv λ1400, C λ1549, Al iii λ1857, Mg ii λ2799. calculate these using spectrum listed DR5 catalog, also spectra from additional SDSS observing epochs...
Single-epoch virial black hole (BH) mass estimators utilizing broad emission lines have been routinely applied to high-redshift quasars estimate their BH masses. Depending on the redshift, different line (Halpha, Hbeta, MgII, CIV) are often used with optical/near-infrared spectroscopy. Here we use a homogeneous sample of 60 intermediate-redshift (z~1.5-2.2) SDSS optical and near-infrared spectra covering CIV through Halpha investigate consistency between estimators. We critically compare...
We present the Data Release 9 Quasar (DR9Q) catalog from Baryon Oscillation Spectroscopic Survey (BOSS) of Sloan Digital Sky III. The includes all BOSS objects that were targeted as quasar candidates during survey, are spectrocopically confirmed quasars via visual inspection, have luminosities Mi[z=2]<-20.5 (in a $\Lambda$CDM cosmology with H0 = 70 km/s/Mpc, $\Omega_{\rm M}$ 0.3, and $\Omega_{\Lambda}$ 0.7) either display at least one emission line full width half maximum (FWHM) larger than...
We present reverberation mapping results from the first year of combined spectroscopic and photometric observations Sloan Digital Sky Survey Reverberation Mapping Project. successfully recover time delays between $g+i$-band emission broad H$\beta$ line for a total 44 quasars, H$\alpha$ in 18 quasars. Time are computed using JAVELIN CREAM software traditional interpolated cross-correlation function (ICCF): Using well defined criteria, we report measurements 32 13 lags with JAVELIN, 42 17...
SDSS-V will be an all-sky, multi-epoch spectroscopic survey of over six million objects. It is designed to decode the history Milky Way, trace emergence chemical elements, reveal inner workings stars, and investigate origin planets. also create integral-field map gas in Galaxy Local Group that 1,000x larger than current state art at high enough spatial resolution self-regulation mechanisms galactic ecosystems. pioneer systematic, monitoring across whole sky, revealing changes on timescales...
Abstract We present a catalog of continuum and emission-line properties for 750,414 broad-line quasars included in the Sloan Digital Sky Survey Data Release 16 quasar (DR16Q), measured from optical spectroscopy. These cover broad ranges redshift (0.1 ≲ z 6) luminosity (44 log( L bol /erg s −1 ) 48), probe lower luminosities than an earlier compilation SDSS DR7 quasars. Derived physical quantities such as single-epoch virial black hole masses bolometric are also this catalog. improved...
Context. In November 2019, eROSITA on board of the Spektrum-Roentgen-Gamma (SRG) observatory started to map entire sky in X-rays. After four-year survey program, it will reach a flux limit that is about 25 times deeper than ROSAT. During SRG performance verification phase, observed contiguous 140 deg 2 area down final depth all-sky (eROSITA Final Equatorial-Depth Survey; eFEDS), with goal obtaining census X-ray emitting populations (stars, compact objects, galaxies, clusters and active...
We present the first results from JWST ASPIRE program (A SPectroscopic survey of biased halos In Reionization Era). This represents an imaging and spectroscopic 25 reionization-era quasars their environments by utilizing unprecedented capabilities NIRCam Wide Field Slitless Spectroscopy (WFSS) mode. will deliver largest ($\sim280~{\rm arcmin}^2$) galaxy redshift at 3-4 $\mu$m among Cycle-1 programs provide extensive legacy values for studying formation earliest supermassive black holes...
Abstract We present the final data from Sloan Digital Sky Survey (SDSS) Reverberation Mapping (RM) project, a precursor to SDSS-V Black Hole Mapper RM program. This set includes 11 yr photometric and 7 spectroscopic light curves for 849 broad-line quasars over redshift range of 0.1 < z 4.5 luminosity L bol = 10 44−47.5 erg s −1 , along with spectral variability measurements. report 23, 81, 125, 110 lags (relative optical continuum variability) broad H α β Mg ii C iv using SDSS-RM sample,...
Abstract JWST is revealing a remarkable new population of high-redshift ( z ≳ 4), low-luminosity active galactic nuclei in deep surveys and detecting the host galaxy's stellar light most luminous massive quasars at ∼ 6 for first time. Recent findings claim that supermassive black holes (SMBHs) these systems are significantly more than predicted by local hole (BH) mass–stellar mass <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi...
Type 2 quasars are luminous active galactic nuclei (AGN) whose central regions obscured by large amounts of gas and dust. In this paper, we present a catalog type from the Sloan Digital Sky Survey (SDSS), selected based on their optical emission lines. The contains 887 objects with redshifts z < 0.83; is six times larger than previous version far largest sample in literature. We derive [OIII]5008 luminosity function for 10^8.3 Lsun L[OIII] 10^10 (corresponding to intrinsic luminosities up...
We present measurements of the quasar two-point correlation function, ξQ, over redshift range 0.3 ⩽ z 2.2 based upon data from Sloan Digital Sky Survey (SDSS). Using a homogeneous sample 30,239 quasars with spectroscopic redshifts Data Release 5 Quasar Catalog, our study represents largest used for this type investigation to date. With and an areal coverage ≈4000 deg2, we 25 h−3 Gpc3 (comoving) universe in volume, assuming current Lambda Cold Dark Matter (ΛCDM) cosmology. Over range, find...
Using a homogenous sample of 38,208 quasars with sky coverage ∼4000 deg2 drawn from the Sloan Digital Sky Survey Data Release Five quasar catalog, we study dependence clustering on luminosity, virial black hole (BH) mass, color, and radio loudness. At z < 2.5, depends weakly luminosity BH typical uncertainty levels ∼10% for measured correlation lengths. These weak dependences are consistent models in which substantial scatter between host dark matter halo mass has diluted any difference,...
We present a measurement of the Type I quasar luminosity function at z = 5 using large sample spectroscopically confirmed quasars selected from optical imaging data. measure bright end (M1450 < −26) with Sloan Digital Sky Survey (SDSS) data covering ∼6000 deg2, then extend to lower luminosities −24) newly discovered, faint ∼ 235 deg2 deep, coadded in SDSS Stripe 82 region (the celestial equator Southern Galactic Cap). The includes 14 spectra obtained as ancillary science targets SDSS-III...
We present a new measurement of the optical Quasar Luminosity Function (QLF), using data from Sloan Digital Sky Survey-III: Baryon Oscillation Spectroscopic Survey (SDSS-III: BOSS). From SDSS-III Data Release Nine (DR9), we select uniform sample 22,301 i<=21.8 quasars over an area 2236 sq. deg with confirmed spectroscopic redshifts between 2.2<z<3.5, filling in key part luminosity-redshift plane for quasar studies. derive completeness survey through simulated photometry, and check this...